Why Choose the Mersen NH4AM69V500P-2 Motor Protection Fuse-Link?
The Mersen NH4AM69V500P-2 is a high-performance DIN NH aM low-voltage fuse-link designed specifically for short-circuit protection in high-power industrial motor circuits. Rated at 500 A and 690 V AC, this NH Size 4 fuse-link helps protect motors, contactors, starters, cables and associated switching equipment against damaging fault currents.
As part of Mersen's NH aM fuse-link range, the NH4AM69V500P-2 features live gripping lugs and an integrated striker. The striker can provide mechanical operation or remote indication when the fuse-link has operated, making the product particularly suitable for switch-fuse equipment, motor control centres and installations requiring rapid fault identification.
The aM partial-range operating characteristic provides strong current-limiting performance while allowing the temporary starting currents associated with large electric motors. Because an aM fuse-link provides short-circuit protection rather than overload protection, it must be coordinated with a suitable thermal overload relay, electronic overload device or motor protection system.
Key Advantages
- Purpose-designed for high-power motor circuit short-circuit protection.
- 500 A rated current for demanding industrial motor applications.
- 690 V AC rated voltage for industrial power systems.
- Strong current-limiting performance helps reduce fault energy.
- Integrated striker supports mechanical actuation or fuse status indication.
- Allows normal motor starting currents without unnecessary fuse operation.
- Standard NH4 construction for compatible fuse bases and disconnectors.
Key Features
- Mersen NH aM 500–690 V AC fuse-link range.
- Catalogue reference: NH4AM69V500P-2.
- Manufacturer item number: P1000076.
- 500 A rated current.
- 690 V AC rated voltage.
- NH Size 4 construction.
- aM partial-range motor protection characteristic.
- Integrated striker mechanism.
- Live, non-isolated gripping lugs.
- 100 mm body width.
Reliable Short-Circuit Protection for High-Power Motors
The Mersen NH4AM69V500P-2 is engineered to limit and interrupt severe fault currents before they can cause extensive damage to motors, contactors, starters, cables and switchgear. Its current-limiting action reduces the thermal and electrodynamic stresses placed on equipment during a short circuit, supporting improved installation safety and reliability.
As an aM partial-range fuse-link, this product must be used with correctly selected overload protection. When coordinated with an overload relay or electronic motor protection device, it provides an effective protection system that allows normal motor starting currents while responding rapidly to dangerous short-circuit conditions.
Typical Applications
- High-power industrial motor control centres.
- Large direct-on-line and star-delta motor starters.
- Pumps, fans and compressor systems.
- Heavy manufacturing and processing machinery.
- Industrial switch-fuse disconnectors.
- Power distribution and automation panels.
